氢-空气绕流无限长斜劈斜爆震波数值模拟

Numerical Simulation of Oblique Detonation Waves in H_2-Air Mixture Induced by an Infinite Wedge

采用二维多组分有化学反应的Euler方程,考虑单步化学反应,采用有限反应速率模型,对斜爆震波进行计算,通过将数值模拟结果与实验结果对比,验证了数值模拟方法的有效性。在此基础上,对氢空气绕流无限长斜劈的斜爆震过程进行了数值模拟,分析了斜劈角度对斜爆震波特性的影响。结果表明:当斜劈角度增大时,爆震波中的化学反应速率随之增大,相应的斜爆震波的角度也增加,波后的温度更高,同时波后法向马赫数减小。

Numerical simulation method of oblique detonation wave was established for H_2-air mixture.Two-dimensional multi-specie Euler equations are adopted as governing equations.As for H_2-air reaction,the single-step reaction with finite reaction rate model is used.Simulation results are in good agreement with experimental data.The oblique detonation wave in H_2-air mixture induced by an infinite wedge was calculated.The predicted results show the effect of the wedge angle on the oblique detonation wave.With the wedge angle increasing,the reaction rate of the oblique detonation wave,the angle of the oblique detonation wave and the temperature downstream of the wave increase. The large wedge angle gives rise to small normal component of the Mach number downstream of the wave.